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vga: avoid crash if no default vga card 

QEMU in some arch will crash when executing -vga help command, because
there is no default vga model.  Add check to this case and avoid crash.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/978

Signed-off-by: Guo Zhi <qtxuning1999@sjtu.edu.cn>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Tested-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20220503091724.970009-1-qtxuning1999@sjtu.edu.cn>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
master
Guo Zhi 2022-05-03 17:17:24 +08:00 committed by Laurent Vivier
parent ad4c7f529a
commit 6985d8ede9
1 changed files with 2 additions and 1 deletions
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3
softmmu/vl.c
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@ -981,7 +981,8 @@ static void select_vgahw(const MachineClass *machine_class, const char *p)
if (vga_interface_available(t) && ti->opt_name) {
printf("%-20s %s%s\n", ti->opt_name, ti->name ?: "",
g_str_equal(ti->opt_name, def) ? " (default)" : "");
(def && g_str_equal(ti->opt_name, def)) ?
" (default)" : "");
}
}
exit(0);